I set up a sound alert for incoming mails in Thunderbird on my Ubuntu 10.04 desktop. The following are the steps for the process:
First you have to download the add-on themes for thunderbird. They are available at https://addons.mozilla.org/en-US/thunderbird/addon/2610/
After that you have to configure them. You can get those details from the following websitehttp://tjeb.nl/Projects/Mailbox_Alert/
If you navigate to the website above, you will see that you can setup an
alert for your folder 'Inbox' and you will see that in the window where you configure it, you
are specifying the name of a sound file. In the example mentioned on the
link above, the the sound file for incoming mails from any subject is
stored in a directory named /home/jeltejan/sounds/mail/doorbell.wav.
Similarly you can point it to any sound file of your choice.
So may be, you can create a directory named /home/your name/sounds/mail/
and download some .wav files (sound files) and then configure your
thunderbird plugin to play a sound for all incoming mails.So you could download
the ones that you like and use it for incoming mail alerts. The links
below have may .wav files for incoming mail alerts:http://www.ilovewavs.com/Events/GotMail/GotMail.htmhttp://www.thesoundarchive.com/email.asp